EP1829434B1 - Hid ballast - Google Patents
Hid ballast Download PDFInfo
- Publication number
- EP1829434B1 EP1829434B1 EP20050818367 EP05818367A EP1829434B1 EP 1829434 B1 EP1829434 B1 EP 1829434B1 EP 20050818367 EP20050818367 EP 20050818367 EP 05818367 A EP05818367 A EP 05818367A EP 1829434 B1 EP1829434 B1 EP 1829434B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching
- lamp
- control apparatus
- power control
- elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Revoked
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/2881—Load circuits; Control thereof
- H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/2885—Static converters especially adapted therefor; Control thereof
- H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to power control apparatus for providing electric power from a utility to desired voltage and current characteristics for a load.
- the present invention relates to a method and apparatus for providing current to a high intensity discharge lamp via a lamp ballast with reduced power loss.
- a load There are many known circumstances when power should be provided to a load. Under such circumstances the power supplied to a load must be strictly controlled so that thresholds in that load are met but not exceeded.
- a load is a lamp. High intensity discharge lamp are one variety of lamp.
- High intensity discharge (HID) lamps have been available for a number of years and consist of a sealed, usually double envelope inside which a plasma discharge takes place.
- the discharge ionises the gas which will emit light at various wavelengths depending on the composition of the gas within the discharge envelope.
- a full bridge circuit is used for a dual purpose to generate a high frequency resonant voltage to strike the lamp and a low frequency, controlled current during the run condition.
- Q3 and Q4 are turned on and off at a suitable low frequency such that when Q3 is on Q4 is off and visa versa. If Q3 is on then Q1 is off always off and similarly if Q4 is on then Q2 is always off. Assuming that Q3 is on, then Q2 is alternately turned on and off (Pulse Width Modulated PWM) at a higher frequency than Q3 and Q4 to control the current through the load. As any current flowing in L1 will be flowing in D1 before Q2 turns on, then Q2 has to commutate this current before the voltage on D2 cathode falls to zero. The sequence of Q2 turning on is shown in the waveforms of Fig3 .
- the bridge circuit can be supplied from any of a number of well known electronic pfc stages that give a suitable stable high voltage rail.
- the AC power source comprises a half bridge circuit having two electronic switches and two coupling capacitors. Capacitors can be provided in parallel with the electronic switches to enable zero voltage switching of the switches.
- power control apparatus for providing current to a lamp, the apparatus being as defined by claim 1.
- Embodiments of the present invention provide the advantage that the switching elements in lamp ballast circuitry are switched, during a normal mode of operation, only under a zero voltage condition so that power dissipated is reduced compared to prior art ballast.
- the invention combines the functions of a current source with zero voltage switching (ZVS) whilst preserving the resonant strike function into one full bridge power conversion stage, reducing power losses, ripple current in the lamp, EMI and improving efficiency.
- ZVS zero voltage switching
- the switches Q1-4 are shown as bipolar devices but could equally be mos-fets or any other type of electronic switch.
- the diode D1 and capacitor C3 could be part of the switch Q1 or separate. If C3 is part of the switching element it may be augmented by additional capacitance in parallel.
- Q3 and Q4 are turned on alternately at a low frequency.
- Q3 is on Q4 is off and visa versa.
- Q2 is turned on and off by pulse width modulation (PWM) using ZVS in such a way as to maintain the current in the lamp substantially constant.
- PWM pulse width modulation
- Q1 is turned off for all the time that Q3 is on in this mode.
- the value of C2 is such that its voltage does not change substantially during the time that it takes for Q2 to turn on or off.
- the ZVS action is described as follows with reference to the waveforms in fig 6 and fig 7 .
- Q1 When Q3 turns off and Q4 turns on then Q1 is turned on and off in the same manner as was Q2 and Q2 is turned off for all the time that Q4 is on. In this way Q1 and Q2 are turned on and off with substantially zero volts across them and so have minimal switching losses. It is clear that the rate at which the voltage changes across the switches is determined by C3, C4 and L2 and so can be optimised by changing these values for EMI and/or power loss.
- the circuit of Fig 5 contains an extra LC filter stage compared to the prior art and as such leads to reduced current ripple in the lamp and reduces the chances of acoustic arc resonance caused by such excessive ripple currents.
- Q3 and Q4 may be driven at high frequency either on their own or in conjunction with Q1 and Q2 to cause L1/C1 to resonate and generate the high voltage to start the lamp.
- Embodiments of the present invention have been described in which the status, that is whether a switch is on or off, is changed only at a point in time when the voltage across a switching element is substantially zero or much reduced. In this way power dissipated by the device is controlled.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
- The present invention relates to power control apparatus for providing electric power from a utility to desired voltage and current characteristics for a load. In particular, but not exclusively, the present invention relates to a method and apparatus for providing current to a high intensity discharge lamp via a lamp ballast with reduced power loss.
- There are many known circumstances when power should be provided to a load. Under such circumstances the power supplied to a load must be strictly controlled so that thresholds in that load are met but not exceeded. One example of a load is a lamp. High intensity discharge lamp are one variety of lamp.
- High intensity discharge (HID) lamps have been available for a number of years and consist of a sealed, usually double envelope inside which a plasma discharge takes place. The discharge ionises the gas which will emit light at various wavelengths depending on the composition of the gas within the discharge envelope.
- To obtain maximum life, efficient energy conversion and safe operation requires close control of the lamp operating conditions both during start up and running. During the starting phase an initial high voltage, up to several kilo volts must be applied across the lamp to start the discharge. The power and current into the lamp must then be closely controlled until it reaches its normal hot running conditions. As the lamp moves from the start-up mode of operation to the normal running phase of operation both the voltage across the lamp and impedance of the lamp vary markedly. Any ballast used to run the lamp must take this into account.
- Early passive ballasts consisted of an inductor in series with the supply that crudely limited the current into the lamp as shown in
Fig 1 . The impedance of the inductor L1 is selected to be large in comparison to the effective lamp impedance so that changes in the lamp characteristics during operation and over its life have a reduced effect on the lamp current. A capacitor C1 is required on the input to bring the power factor (PF) closer to unity as the inductor forces the current to lag by 90 degrees. In addition an igniter circuit I1. is required to provide the high voltage to strike the lamp initially. - Due to the large sizes of L1, C1 I1, losses in L1 and problems of maintaining good PF over the operating voltage range and lifetime of the ballast the industry has moved to active electronic solutions.
Current electronic solutions can be exemplified byUS Patent 4,725,762 by Otto Jagschitz . This is illustrated inFig 2 . - Here a full bridge circuit is used for a dual purpose to generate a high frequency resonant voltage to strike the lamp and a low frequency, controlled current during the run condition.
- In normal operation Q3 and Q4 are turned on and off at a suitable low frequency such that when Q3 is on Q4 is off and visa versa. If Q3 is on then Q1 is off always off and similarly if Q4 is on then Q2 is always off. Assuming that Q3 is on, then Q2 is alternately turned on and off (Pulse Width Modulated PWM) at a higher frequency than Q3 and Q4 to control the current through the load. As any current flowing in L1 will be flowing in D1 before Q2 turns on, then Q2 has to commutate this current before the voltage on D2 cathode falls to zero. The sequence of Q2 turning on is shown in the waveforms of
Fig3 . At time T0 current is flowing in L1 and D1 and full voltage appears across Q2. At time T1 Q2 starts to turn on and current in it rises until at time T2 the current in Q2 equals that in L1. The current in Q2 continues to rise as D1 now conducts in the reverse direction and it starts to recover and reaches a peak at T3. By time T4 D1 has fully recovered, its current falls to zero and the voltage across Q2 now falls to a low value. As will be evident from the waveforms during the time T1 to T3, Q2 has current flowing through it and the full high voltage supply across it and so will dissipate significant energy as it turns on. The peak current that flows during this time is the sum of the current in L1 and the peak reverse recovery current in D1. - Referring to
Fig 4 . At time T6 Q2 stars to turn off and the instant the current tries to reduce in L1 the voltage across it rises to the full supply and the difference in current between that flowing in L1 and Q2 flows in D1. The current continues to fall in Q2 and rise in D1 until at time T7 Q2 is off and D1 is conducting all the current in L1. From the waveforms it can be seen that Q2 has full supply voltage across it and current flowing through it from time T6 to T7 and so dissipates significant energy. - A similar situation occurs when Q4 is on and Q1 is switching with diode current in D2. This method of switching is called hard switching.
- The bridge circuit can be supplied from any of a number of well known electronic pfc stages that give a suitable stable high voltage rail.
- There are three main areas where the prior art is deficient.
- 1) Hard switching in the full bridge switches leads to increased power losses as noted above; also
- 2) The hard switching leads to the generation of electromagnetic interference (EMI) that has to be suppressed by filtering within the ballast; also
- 3) Current ripple in the lamp is significant due to the single stage filter formed by L1 and C1.
- It is an aim of the present invention to at least partly mitigate the above-mentioned problems.
-
DE 195 23 750 describes an AC power source for providing power to a load. The AC power source comprises a half bridge circuit having two electronic switches and two coupling capacitors. Capacitors can be provided in parallel with the electronic switches to enable zero voltage switching of the switches. - It is an aim of embodiments of the present invention to provide apparatus which may be in the form of circuitry for controlling current applied to a load so that the current in the load meets required thresholds but does not exceed predetermined thresholds.
- It is an aim of embodiments of the present invention to provide a lamp ballast and a method for operating a lamp ballast in which the switching status of switching elements is switched only at times when a zero or minimal voltage is applied across a switching element. Power losses are thus much reduced.
- According to a first aspect of the present invention there is provided power control apparatus for providing current to a lamp, the apparatus being as defined by claim 1.
- According to a second aspect of the present invention there is provided a method for providing current in a lamp, the method being as defined by claim 16.
- Embodiments of the present invention provide the advantage that the switching elements in lamp ballast circuitry are switched, during a normal mode of operation, only under a zero voltage condition so that power dissipated is reduced compared to prior art ballast.
- Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which;
-
Figure 1 illustrates a prior art ballast; -
Figure 2 illustrates another prior art ballast; -
Figure 3 illustrates the response of parts of the prior art circuit; -
Figure 4 illustrates the response at parts of the prior art circuitry; -
Figure 5 illustrates a lamp ballast according to an embodiment of the present invention; -
Figure 6 illustrates timings and development of other parameters; and -
Figure 7 illustrates the development of certain parameters in the circuit offigure 5 . - The invention combines the functions of a current source with zero voltage switching (ZVS) whilst preserving the resonant strike function into one full bridge power conversion stage, reducing power losses, ripple current in the lamp, EMI and improving efficiency.
- Whilst the specifically described embodiments are described with respect to lamp ballast it will be understood that embodiments of the present invention are generally applicable to power control for the application to loads of varying types.
- The switches Q1-4 are shown as bipolar devices but could equally be mos-fets or any other type of electronic switch. The diode D1 and capacitor C3 could be part of the switch Q1 or separate. If C3 is part of the switching element it may be augmented by additional capacitance in parallel. Similarly with Q2, D2, C4 and Q3, Q4 and D3, D4.
- With reference to
fig 5 . During normal operation Q3 and Q4 are turned on alternately at a low frequency. When Q3 is on Q4 is off and visa versa. At the time that Q3 is turned on Q2 is turned on and off by pulse width modulation (PWM) using ZVS in such a way as to maintain the current in the lamp substantially constant. Q1 is turned off for all the time that Q3 is on in this mode. The value of C2 is such that its voltage does not change substantially during the time that it takes for Q2 to turn on or off. The ZVS action is described as follows with reference to the waveforms infig 6 andfig 7 . - For Q2 turn off assume that Q3 and Q2 are on and the current has risen in Q2 and L2, time T0 in
fig 6 . When it reaches a preset value determined by the control Q2 is turned off at time T1 and the voltage across it starts to rise as the current in L2 charges the combined capacitance of C3 and C4. The combined values of C3 and C4 limit the rate of rise of voltage across Q2. When the voltage reaches the supply rail D1 conducts. L2 now discharges its stored energy into C2 and the current flows through D1 until the current in L2 reaches zero at which point D1 stops conducting. - With reference to
fig 7 . The current in L2 now reverses at time T3 as D1 recovers and it does a resonant ring with the combined capacitance of C3 and C4 and the voltage across Q2 falls until it reaches zero at time T4 when D2 conducts. The control then switches Q2 on again and the cycle repeats as long as Q3 is on. ° - When Q3 turns off and Q4 turns on then Q1 is turned on and off in the same manner as was Q2 and Q2 is turned off for all the time that Q4 is on. In this way Q1 and Q2 are turned on and off with substantially zero volts across them and so have minimal switching losses. It is clear that the rate at which the voltage changes across the switches is determined by C3, C4 and L2 and so can be optimised by changing these values for EMI and/or power loss.
- The circuit of
Fig 5 contains an extra LC filter stage compared to the prior art and as such leads to reduced current ripple in the lamp and reduces the chances of acoustic arc resonance caused by such excessive ripple currents. - During start up and striking of the lamp Q1 and Q2 are driven alternately at high frequency in order to cause L1/C1 to resonate and generate the necessary high voltage across the lamp to cause it to strike.
- Alternatively Q3 and Q4 may be driven at high frequency either on their own or in conjunction with Q1 and Q2 to cause L1/C1 to resonate and generate the high voltage to start the lamp.
- After the lamp discharge is initiated the operation of Q1 and Q2 progresses to the normal running condition previously described to control the lamp current.
- Embodiments of the present invention have been described in which the status, that is whether a switch is on or off, is changed only at a point in time when the voltage across a switching element is substantially zero or much reduced. In this way power dissipated by the device is controlled.
- In particular it will be understood that embodiments of the present invention can be used with a half bridge arrangement.
Claims (19)
- Power control apparatus for providing current to a lamp, comprising:a full/half bridge switching circuit including two first switching elements (Q1, Q2) connected in series between high and low power supplies, each one of the two first switching elements for supplying power to the lamp when a respective first switching element is switched on;means for switching a state of each said first switching element;first and second inductive elements (L1, L2), a node between the two first switching elements (Q1, Q2) being connected to a first lamp terminal via the first and second inductive elements (L1, L2); anda capacitor (C1) connected in parallel with said lamp between the first lamp terminal and a second lamp terminal and arranged to provide a resonant circuit together with the first inductive element (L1), characterised in that the first inductive element (L1) is connected to the first lamp terminal, the means for switching is adapted to switch the two first switching elements alternately during a start-up mode of operation at a frequency to cause said resonant circuit to resonate and generate a voltage to strike the lamp, and in that the means for switching is further adapted to switch a state of each said first switching element, during a normal mode of operation, only at a time when a substantially zero voltage is applied across said first switching element.
- The power control apparatus as claimed in claim 1 wherein said apparatus comprises a lamp ballast and said full/half bridge switching circuit comprises a full bridge switching circuit.
- The power control apparatus as claimed in claim 2 wherein said full bridge switching circuit comprises two diagonal pairs of switching elements, each pair comprising one of said first switching elements (Q1, Q2) arranged to repeatedly switch on and off when a remaining switching element (Q3, Q4) in the pair is on and to remain off when said remaining switching element is off.
- The power control apparatus as claimed in claim 3 wherein the two remaining switching elements (Q3, Q4) are connected in series and between a high and low power supply.
- The power control apparatus as claimed in claim 4 wherein the lamp is connected via the second lamp terminal to a node between said remaining switching elements (Q3, Q4).
- The power control apparatus as claimed in claim 1 further comprising a capacitor (C2) connected between a low power supply and a node between the first and second inductive elements (L1, L2).
- The power control apparatus as claimed in claim 3 further comprising a capacitor element (C3, C4) arranged in parallel with each first switching element (Q1, Q2).
- The power control apparatus as claimed in claim 7 wherein each first switching element (Q1, Q2) comprises a MOSFET and said capacitor element (C3, C4) comprises a parasitic capacitance of said MOSFET.
- The power control apparatus as claimed in claim 8 further comprising a further capacitor connected in parallel with the parasitic capacitance of said MOSFET.
- The power control apparatus as claimed in claim 7 wherein each first switching element (Q1, Q2) comprises a bipolar device and said capacitor element (C3, C4) comprises a discrete capacitor connected in parallel with the said first switching element.
- The power control apparatus as claimed in claim 3 further comprising a diode element in parallel with each of the first switching elements (D1, D2).
- The power control apparatus as claimed in claim 11 wherein each of said first switching elements (Q1, Q2) comprises a MOSFET and said diode element (D1, D2) comprises a parasitic diode of said MOSFET.
- The power control apparatus as claimed in claim 12 further comprising a further diode element connected in parallel with the parasitic diode of said MOSFET.
- The power control apparatus as claimed in claim 11 wherein each of said first switching elements (Q1, Q2) comprises a bipolar device and said diode element (D1, D2) comprises a discrete diode connected in parallel with each said first switching element.
- The power control apparatus as claimed in claim 1 further comprising:a first and second diode (D5, D6) connected in series between a high and low power supply, a node between the first and second diodes being connected to a node between said first and second inductive elements (L1, L2).
- A method for providing current in a lamp, comprising the steps of:in a normal mode of operation, providing a low frequency controlled current to said lamp via a power control apparatus including a full/half bridge switching circuit comprising two first switching elements (Q1, Q2) connected in series between high and low power supplies, a node between the two first switching elements being connected to a first lamp terminal via a first and second inductive elements (L1, L2), by switching state in each said first switching element in said full/half bridge switching circuit only when a substantially zero voltage is applied across said first switching element; andduring a start-up mode of operation striking the lamp via a resonance circuit comprising a capacitor (C1) connected in parallel with said lamp between the first lamp terminal and a second lamp terminal and the first inductive element (L1) connected to the first lamp terminal by switching the two first switching elements alternately at a frequency to cause said resonant circuit to generate a voltage to strike the lamp.
- The method as claimed in claim 16 wherein said full/half bridge switching circuit comprises a full bridge switching circuit and said power control apparatus comprises a lamp ballast.
- The method as claimed in claim 17 further comprising the steps of:during said normal mode of operation, providing control signals to two pairs of diagonal switching elements of said full bridge switching circuit, each pair of switching elements comprising one of the first elements (Q1, Q2), to selectively turn said switching element on and off; wherebythe first switching element in each pair is switched on according to a zero voltage switching sequence only when a remaining switching element (Q3, Q4) in the pair is on.
- The method as claimed in claim 17 further comprising the steps of:determining when a voltage at the node between the two first switching elements reaches a predetermined threshold voltage; andswitching a one of said first switching element on when the threshold voltage is reached.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0427682A GB0427682D0 (en) | 2004-12-17 | 2004-12-17 | Power control |
PCT/GB2005/004611 WO2006064182A1 (en) | 2004-12-17 | 2005-12-02 | Hid ballast |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1829434A1 EP1829434A1 (en) | 2007-09-05 |
EP1829434B1 true EP1829434B1 (en) | 2014-01-29 |
Family
ID=34090237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050818367 Revoked EP1829434B1 (en) | 2004-12-17 | 2005-12-02 | Hid ballast |
Country Status (9)
Country | Link |
---|---|
US (1) | US8053999B2 (en) |
EP (1) | EP1829434B1 (en) |
JP (1) | JP2008524787A (en) |
KR (1) | KR20070101858A (en) |
CN (1) | CN101116379B (en) |
AU (1) | AU2005315423B2 (en) |
CA (1) | CA2590915A1 (en) |
GB (1) | GB0427682D0 (en) |
WO (1) | WO2006064182A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102160467B (en) * | 2008-09-17 | 2014-01-22 | 奥斯兰姆有限公司 | Circuit arrangement and method for operation of discharge lamp |
CN102884374B (en) * | 2009-11-02 | 2015-05-27 | 香港城市大学 | Arrangements or circuits for driving DC-powered lighting devices |
CN102612238B (en) * | 2012-03-26 | 2015-01-14 | 上海信耀电子有限公司 | HID (high intensity discharge) ballast based on DSP (digital signal processor) |
TWI514929B (en) * | 2013-08-30 | 2015-12-21 | Lextar Electronics Corp | Light adjusting device with switching element |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT392384B (en) | 1985-02-04 | 1991-03-25 | Zumtobel Ag | Ballast for the operation of gas discharge lamps with direct current |
TW344190B (en) * | 1992-09-22 | 1998-11-01 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
US5371440A (en) | 1993-12-28 | 1994-12-06 | Philips Electronics North America Corp. | High frequency miniature electronic ballast with low RFI |
DE19523750A1 (en) | 1995-06-29 | 1997-01-02 | Thomson Brandt Gmbh | LF AC voltage source e.g. for 50 to 200 Hz |
JPH11509971A (en) * | 1996-05-23 | 1999-08-31 | コーニンクレッカ、フイリップス、エレクトロニクス、エヌ.ヴィ. | Circuit device |
US6124682A (en) * | 1996-11-19 | 2000-09-26 | Micro Tech Limited | Lamp driver circuit using resonant circuit for starting lamp |
CA2206200C (en) * | 1997-04-18 | 2000-06-27 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device |
EP1114571B1 (en) * | 1998-09-18 | 2002-07-31 | Knobel Ag Lichttechnische Komponenten | Circuit for operating gas discharge lamps |
US6020691A (en) | 1999-04-30 | 2000-02-01 | Matsushita Electric Works R & D Laboratory, Inc. | Driving circuit for high intensity discharge lamp electronic ballast |
KR20000012429A (en) * | 1999-12-03 | 2000-03-06 | 김중성 | Electronic ballast for gas discharge lamp and operating method |
DE19963289A1 (en) * | 1999-12-27 | 2001-06-28 | Tridonic Bauelemente | Circuit arrangement to operate gas discharge lamp; has full bridge circuit supplied by direct current and has four controllable switches and circuit to control switches in normal and starting phases |
US20020030451A1 (en) * | 2000-02-25 | 2002-03-14 | Moisin Mihail S. | Ballast circuit having voltage clamping circuit |
US6380694B1 (en) | 2000-09-22 | 2002-04-30 | Matsushita Electric Works R & D Laboratory | Variable structure circuit topology for HID lamp electronic ballasts |
US6870324B2 (en) * | 2001-08-15 | 2005-03-22 | Koninklijke Philips Electronics N.V. | Method for color mixing with arc stability and straightening of HID lamps operated at high frequencies using duty cycle modulation |
US6670779B2 (en) * | 2001-12-05 | 2003-12-30 | Koninklijke Philips Electronics N.V. | High power factor electronic ballast with lossless switching |
US6879115B2 (en) | 2002-07-09 | 2005-04-12 | International Rectifier Corporation | Adaptive ballast control IC |
US7141937B2 (en) * | 2002-10-28 | 2006-11-28 | Matsushita Electric Works, Ltd. | High-pressure discharge lamp operation device and illumination appliance having the same |
JP2004260882A (en) | 2003-02-24 | 2004-09-16 | Sanken Electric Co Ltd | Power converter |
US7061187B2 (en) * | 2003-03-19 | 2006-06-13 | Moisin Mihail S | Circuit having clamped global feedback for linear load current |
US6992902B2 (en) | 2003-08-21 | 2006-01-31 | Delta Electronics, Inc. | Full bridge converter with ZVS via AC feedback |
-
2004
- 2004-12-17 GB GB0427682A patent/GB0427682D0/en not_active Ceased
-
2005
- 2005-12-02 US US11/793,248 patent/US8053999B2/en not_active Expired - Fee Related
- 2005-12-02 CN CN2005800480737A patent/CN101116379B/en not_active Expired - Fee Related
- 2005-12-02 KR KR1020077015700A patent/KR20070101858A/en not_active Application Discontinuation
- 2005-12-02 JP JP2007546158A patent/JP2008524787A/en active Pending
- 2005-12-02 AU AU2005315423A patent/AU2005315423B2/en not_active Ceased
- 2005-12-02 WO PCT/GB2005/004611 patent/WO2006064182A1/en active Application Filing
- 2005-12-02 CA CA 2590915 patent/CA2590915A1/en not_active Abandoned
- 2005-12-02 EP EP20050818367 patent/EP1829434B1/en not_active Revoked
Also Published As
Publication number | Publication date |
---|---|
CN101116379A (en) | 2008-01-30 |
KR20070101858A (en) | 2007-10-17 |
CN101116379B (en) | 2011-04-13 |
US20080252228A1 (en) | 2008-10-16 |
EP1829434A1 (en) | 2007-09-05 |
CA2590915A1 (en) | 2006-06-22 |
AU2005315423A1 (en) | 2006-06-22 |
WO2006064182A1 (en) | 2006-06-22 |
AU2005315423B2 (en) | 2012-01-19 |
GB0427682D0 (en) | 2005-01-19 |
US8053999B2 (en) | 2011-11-08 |
JP2008524787A (en) | 2008-07-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6380694B1 (en) | Variable structure circuit topology for HID lamp electronic ballasts | |
CA2224300C (en) | Discharge lamp driving bridge circuit | |
EP0984670B1 (en) | High intensity discharge lamp ballast | |
EP1332646B1 (en) | Electronic ballast with continued conduction of line current | |
EP1330943B1 (en) | Ballast self oscillating inverter with phase controlled voltage feedback | |
EP2030486B1 (en) | Lamp driving circuit | |
EP1829434B1 (en) | Hid ballast | |
US20120194070A1 (en) | Operating an electrodeless discharge lamp | |
US20070145905A1 (en) | Driver device for a gas discharge lamp and igniter | |
CN101518158B (en) | Circuit for powering a high intensity discharge lamp | |
JP3758305B2 (en) | Lighting device | |
JP2005051845A (en) | Dc-dc converter and high-pressure discharge lamp lighting device using it | |
US20070164685A1 (en) | Discharge lamp lighting apparatus | |
CN210444521U (en) | Electronic ballast for halogen lamp | |
JPH11233279A (en) | Lighting device for illumination and lamp using the same | |
JP3671243B2 (en) | Resonant power converter | |
Vijayasanthi et al. | A Stochastic Fuzzy Controlled Resonant Converter For Discharge Lamps With PFC | |
EP2145511B1 (en) | Symmetrical rf power supply for inductively coupled electrodeless lamps | |
GB2338358A (en) | High intensity discharge lamp ballast | |
JP4443995B2 (en) | Discharge lighting device | |
Krizhanovski et al. | Low-voltage self-oscillating class E electronic ballast for fluorescent lamps | |
JP3593901B2 (en) | Lighting device | |
KR200316592Y1 (en) | Circuit of lightening fluorescent lamp electronically for reducing wasted power | |
JP3518230B2 (en) | Lighting device | |
KR101207344B1 (en) | Electronic ballast for high intensity discharge lamp |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070704 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20091013 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20130927 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SMETHURST, CHRISTOPHER JOHN |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 651737 Country of ref document: AT Kind code of ref document: T Effective date: 20140215 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602005042643 Country of ref document: DE Effective date: 20140306 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 651737 Country of ref document: AT Kind code of ref document: T Effective date: 20140129 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: VDEP Effective date: 20140129 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140529 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140529 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R026 Ref document number: 602005042643 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
26 | Opposition filed |
Opponent name: TRIDONIC GMBH & CO KG Effective date: 20141028 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R026 Ref document number: 602005042643 Country of ref document: DE Effective date: 20141028 |
|
PLAF | Information modified related to communication of a notice of opposition and request to file observations + time limit |
Free format text: ORIGINAL CODE: EPIDOSCOBS2 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602005042643 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141202 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20141202 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150831 |
|
RDAF | Communication despatched that patent is revoked |
Free format text: ORIGINAL CODE: EPIDOSNREV1 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141202 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141231 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141202 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150701 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141231 |
|
RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
27W | Patent revoked |
Effective date: 20151010 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140430 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20140129 |